Bump mathjax from 3.0.5 to 3.1.0

Bumps [mathjax](https://github.com/mathjax/MathJax) from 3.0.5 to 3.1.0.
- [Release notes](https://github.com/mathjax/MathJax/releases)
- [Commits](https://github.com/mathjax/MathJax/compare/3.0.5...3.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -74,7 +74,7 @@
     "jr-qrcode": "^1.0.7",
     "material-design-icons-iconfont": "^5.0.1",
     "materialize-css": "^0.98.1",
-    "mathjax": "^3.0.0",
+    "mathjax": "^3.1.0",
     "mousetrap": "^1.6.0",
     "ptsans-npm-webfont": "^0.0.4",
     "roboto-fontface": "^0.10.0",